[dstewart]

One set of HRC retainers should last you a very long time. I have never heard of anyone having problems with the HRC retainers. Honda guys have told me they are near bullet prof. Having a extra set of springs on hand cant hurt, that way when its time to freshen up the engine if you cant find the springs at that point your not out of luck. Depending on the cams, Dales, Thorstens, Mori Stage 2 or HRC and how hard you are on the engine will determine how long the springs will last. The HRC springs with HRC cams had a recommended service interval of something like 1000 miles but that was with a 12,000 RPM limiter and never seeing anything below 8,500 RPM durning its life. The HRC cams are more aggressive then Dales grind so Dales cams should be much easier on the springs. Light weight valves, buckets, retainers wont help with spring life. The light parts are only needed to prevent valve float and the damage that WILL occur from the lobes smacking the buckets at high RPM. The HRC springs actually have less seat pressure then OEM and therefore require some mass reduction to prevent float especially if the limiter is to be raised over stock. No one can tell you exactly how much mass is required to loose for any giving RPM limit or cam combo, only an educated guess.

For what its worth, the only thing I can tell you about the HRC seats are they where Ti. I am double and tipple checking with some Honda guys regarding any other, if any, differences that would "require" the kit seats. I should hear back from them in a day or two.